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Internal-crosslinking aqueous polyurethane emulsion and preparation method thereof

A water-based polyurethane, cross-linked technology, applied in the field of internal cross-linked water-based polyurethane emulsion and its preparation, can solve the problems of cumbersome operation, unfavorable construction, low cross-linking degree, etc., and achieve effective solid content, good mechanical properties, The effect of increasing the molecular weight

Active Publication Date: 2011-09-21
BEIJING RADIATION APPL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cross-linking methods for WPU mainly include internal cross-linking and external cross-linking. The internal cross-linking method refers to the introduction of a cross-linking agent during the WPU polymerization process to cause cross-linking of WPU macromolecules, but the degree of cross-linking obtained by this method is not High, at the same time, it is easy to produce gel during emulsification and chain extension, and it is difficult to prepare high-performance and high-stability WPU
Adhesives prepared by external linking method have better comprehensive properties, but WPU and water-dispersible crosslinking agent need to be mixed before use, which is cumbersome to operate and is not conducive to construction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, the preparation of internal crosslinking type aqueous polyurethane emulsion

[0027] After vacuum dehydration, polyoxypropylene diol (N-210, molecular weight 1000) 42g, isophorone diisocyanate (IPDI) 16.84g mixed (wherein, the mass fraction ratio of N-210 and IPDI is 2.49: 1), Under the protection of dry nitrogen, react at 100°C for 2h, after cooling to 75°C, add dimethylolpropionic acid (DMPA) 3g and pentaerythritol triacrylate (PETA) 1.16g to continue the reaction for 4h (wherein, the mass fraction of DMPA and IPDI ratio 1:5.61; the mass fraction ratio of PETA and IPDI 1:14.52), lower the system temperature to 40°C, add 20g of acetone to reduce the viscosity (the mass fraction ratio of acetone and IPDI is 1.19:1), slowly drop Add triethylamine to the prepolymer, then add metered water under high-speed stirring to emulsify to obtain a milky white water-based polyurethane emulsion, distill off the solvent, put the obtained water-based polyurethane emulsion...

Embodiment 2

[0029] Embodiment 2, the preparation of internal crosslinking type aqueous polyurethane emulsion

[0030] Polyoxypropylene diol (N-220, molecular weight 2000) 40g after vacuum dehydration, isophorone diisocyanate (IPDI) 12.54g and 1,6-hexamethylene diisocyanate (HDI) 8.3g are mixed (wherein, N- 220 to the total mass of IPDI and HDI (the mass-number ratio is 1.92:1), reacted at 80°C for 2h under the protection of dry nitrogen. Then cool down to 70°C and add dimethylolpropionic acid (DMPA) 3g and pentaerythritol triacrylate (PETA) 1.06g and continue to react after 4h (wherein, the mass and number ratio of the total mass of DMPA and IPDI and HDI is 1: 6.94; the mass and number ratio of the total mass of PETA and IPDI and HDI is 1: 19.66), reduce system temperature to 40 ℃, add 40g butanone to reduce viscosity (the mass and number ratio of the total mass of butanone and IPDI and HDI 1.92:1), slowly drop the neutralizing agent triethylamine in the prepolymer, then add metered wate...

Embodiment 3

[0032] Embodiment 3, the preparation of internal crosslinking type aqueous polyurethane emulsion

[0033] Mix 35g of polybutylene adipate (PBA-2000) after vacuum dehydration, 8.4g of toluene diisocyanate (TDI) and 6.0g of 1,6-hexamethylene diisocyanate (HDI) (wherein, PBA-2000 and TDI The mass fraction ratio of the total mass of HDI is 2.43:1), and reacted at 80° C. for 2.0 h under the protection of dry nitrogen. Then cool down to 70°C and add dimethylolpropionic acid (DMPA) 3g and pentaerythritol triacrylate (PETA) 1.06g and continue to react after 2h (wherein, the mass and number ratio of the total mass of DMPA and TDI and HDI is 1: 4.8; the mass and number ratio of the total mass of PETA and TDI and HDI is 1: 13.58), reduce system temperature to 40 ℃, add 40g acetone to reduce viscosity (the mass and number ratio of the total mass of acetone and IPDI and HDI is 2.78 : 1), slowly drop neutralizing agent triethylamine in the prepolymer, add metered water to emulsify under hi...

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Abstract

The invention discloses internal-crosslinking aqueous polyurethane emulsion and a preparation method thereof. The preparation method comprises the following steps of: (1) reacting polymer polyols and diisocyanate to obtain a polyurethane compound; (2) adding hydrophilic chain extenders and multifunctional hydroxyl-containing acrylate into the polyurethane compound for reacting, and after the reaction is ended, adding alkali for neutralizing and adding water for emulsifying in sequence to obtain the aqueous polyurethane emulsion; and (3) performing radiation crosslinking on the aqueous polyurethane emulsion by Co-60 gamma rays to obtain the internal-crosslinking aqueous polyurethane emulsion. In the invention, the emulsion is irradiated by using the Co-60 gamma rays to realize the crosslinking of the emulsion, so that the molecular weight of the aqueous polyurethane can be effectively improved, and the aqueous polyurethane emulsion can have higher solid content and better mechanical performance.

Description

technical field [0001] The invention relates to an internal crosslinking water-based polyurethane emulsion and a preparation method thereof, belonging to the field of fine polymer materials and preparation thereof. Background technique [0002] Water-based polyurethane (WPU) is a kind of polymer synthetic material, which has the advantages of wear resistance, corrosion resistance, low temperature flexibility, fatigue resistance, etc. It can be used as adhesives for shoes, coatings, fabric coatings, various packaging Adhesives for products, etc., which use water as the dispersion medium, have the advantages of non-combustibility, environmental protection, and little irritation to the human body. Therefore, replacing traditional solvent-based polyurethane with water-based polyurethane emulsion is an important development direction of polyurethane adhesive products. [0003] The molecular chain of water-based polyurethane contains a large number of hydrophilic groups, and its ...

Claims

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Application Information

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IPC IPC(8): C08J3/28C08J3/24C08J3/03C08G18/67C08G18/66
Inventor 酒永斌翟宇曾心苗王连才郭建梅鲍矛
Owner BEIJING RADIATION APPL RES CENT
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